Among your choices I would go with Brussels since it houses the primary institutions of the EU. The EU is still in its infancy, but they're growing in member states and the relative strength of the Euro make it more significant by the day. The value of any experience with the EU would repay you many times over. As an aside, if you have any opportunity to study in Asia, specifically China, India or Indonesia I would say jump at it. Asia is still a mystery to so many westerners and I believe immersion is the best way to learn. Again, experience in any of the three nations I listed above will reward you monetarily and dramatically enrich you personally. Best of luck. Let us know what you decide.